One example is a salesman at a store like Best Buy who continues to push extended warranties after you say no. (I often resort to losing my temper and saying "If you say another word about the extended warranty, I am going to walk out of the store!")
Another example is an adult that I carpooled with to a political rally. When I told him I telecommuted, he asked me to help him on the campaign during the day. The request was insulting because he assumed that I sat around and did nothing from most of the day.
Later the adult asked me to take a day off of work to fix his computer. At first I pointed out that that was a rude request to make, but he continued to push on me to fix his computer. A day or two later he emailed me screenshots from his computer without me asking for them.
(I should point out that if he had merely asked, "Hey could you look at my computer and help me with something," I probably would have found the time to visit him and help him.)